Structure for gunpowder charge in combined fracturing perforation device

Abstract

This invention provides a structure for gunpowder charge for charging gunpowders of different rates in combined fracturing perforation devices. The structure for gunpowder charge is convenient to mount and transport. In one embodiment, said structure for gunpowder charge comprises an inner gunpowder box located between adjacent perforating charges in the charge frame of a perforation device, and an outer gunpowder box attached to the outer wall of the charge frame, wherein said outer gunpowder box comprises one or two box units ( 2 or 4 ) with at least one claw at the inner side of said box unit, said claw can be locked into a groove or installation hole of the charge frame, and wherein said inner gunpowder box and said outer gunpowder box are charged with gunpowders of different burning rates.

What is claimed is: 
     
       1. A structure for gunpowder charge for a combined fracturing perforation device, said structure for gunpowder charge comprises an inner gunpowder box located between adjacent perforating charges in the charge frame of said perforation device, and an outer gunpowder box attached to the outer wall of the charge frame, wherein said outer gunpowder box comprises one or two box units, each box unit comprises an inner side facing the outer wall of the charge frame, wherein said inner side comprises at least one claw, said claw can be locked into a groove or installation hole of the charge frame, and wherein said inner gunpowder box and said outer gunpowder box are charged with gunpowders of different burning rates. 
     
     
       2. The structure for gunpowder charge of  claim 1 , wherein said box unit has a rectangular or T-shaped projected shape. 
     
     
       3. The structure for gunpowder charge of  claim 1 , wherein said box unit further comprises a box cover at an open end of said box unit. 
     
     
       4. The structure for gunpowder charge of  claim 1 , wherein said outer gunpowder box comprises one box unit ( 2 ) with three claws ( 21 ,  22 ) at the inner side of said box unit ( 2 ) and said three claws ( 21 ,  22 ) are locked into the groove ( 11 ) of the charge frame ( 1 ). 
     
     
       5. The structure for gunpowder charge of  claim 4 , wherein said box unit ( 2 ) comprises an upper end and a lower end, said upper end having two sides each comprising an edge, wherein two of said three claws ( 21 ) are each at the edge of the two sides of the upper end of said box unit ( 2 ), and the other claw ( 22 ) is at the center of the lower end of said box unit ( 2 ). 
     
     
       6. The structure for gunpowder charge of  claim 4 , wherein said three claws are L-shaped. 
     
     
       7. The structure for gunpowder charge of  claim 1 , wherein said outer gunpowder box comprises two box units ( 4 ) which are connected together through a flexible belt ( 5 ), and at least one claw ( 41 ) at the inner side of each of the box unit ( 4 ); wherein said claw ( 41 ) is locked in the installation hole of the charge frame ( 1 ). 
     
     
       8. The structure for gunpowder charge of  claim 7 , wherein said claw ( 41 ) is positioned at the inner side of a free end of said box unit ( 4 ). 
     
     
       9. The structure for gunpowder charge of  claim 7 , wherein said claw ( 41 ) is V-shaped. 
     
     
       10. The structure for gunpowder charge of  claim 7 , wherein said flexible belt ( 5 ) is made from high-temperature resistant metal or non-metallic materials. 
     
     
       11. The structure for gunpowder charge of  claim 10 , wherein said metal or non-metallic materials are temperature resistant in the range of about 121° C.˜250° C. 
     
     
       12. The structure for gunpowder charge of  claim 10 , wherein said non-metallic material is high-strength polyethylene, polytetrafluoroethylene, or polypropylene. 
     
     
       13. The structure for gunpowder charge of  claim 10 , wherein said high temperature resistant metal is aluminum or magnesium. 
     
     
       14. The structure for gunpowder charge of  claim 1 , wherein said box unit is made from high-temperature resistant non-metallic materials. 
     
     
       15. The structure for gunpowder charge of  claim 14 , wherein said non-metallic materials are temperature resistant in the range of about 121° C.˜250° C. 
     
     
       16. The structure for gunpowder charge of  claim 14 , wherein said non-metallic material is high-strength polyethylene, polytetrafluoroethylene, or polypropylene. 
     
     
       17. The structure for gunpowder charge of  claim 1 , wherein said claw is locked into the groove or installation hole of the charge frame through a one-step process. 
     
     
       18. The structure for gunpowder charge of  claim 17 , wherein said one-step process is a sliding process.